This is similar to my other issue with BASE, but I think I may have found the issue.
There is a null point exception in the crash below, and the game does not load up:
https://pastebin.com/39jqRPTf

Nvm i was able to solve this issue by deleting the jsons in the Contenttweaker configs, and the BASE scripts automatically resetted them.

I still want to know what actually caused it. So I can fix it, or at least alert the user